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partitioned_files now always reports the scan as unordered. Parquet scans and the legacy listing-table scan are wrapped in UnorderedExec, which runs the child plan unchanged and publishes properties with no output ordering, so the sort stays for both full results and LIMIT. Files already on disk and the manifest format are left as they are. The regression test writes out-of-order batches, including null timestamps, through the real writer and checks descending order on both providers. Fixes parseablehq#1827
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| Layer / File(s) | Summary |
|---|---|
Remove inferred scan ordering src/query/stream_schema_provider.rs |
A plan wrapper forwards execution while reporting no output ordering. Manifest sort metadata and timestamp ranges no longer mark scans as time-ordered. |
Apply ordering removal to scan plans src/query/stream_schema_provider.rs |
Parquet and legacy listing scan plans use the wrapper. Test builds use session-configured batch size; other builds use the global execution batch size. |
Verify scan sorting src/query/stream_schema_provider.rs |
Tests cover timestamp ordering and nullable values. They check statistics, ordering metadata, and query results with and without LIMIT for standard and legacy listing scans. |
Priority:
Estimated code review effort: 3 (Moderate) | ~20 minutes
Change: Bug fix · Severity of issue fixed: Medium
Possibly related issues
- parseablehq/parseable#1827 — The changes remove inferred ordering from Parquet and listing scans, addressing the reported unsorted
ORDER BY p_timestampresults.
Possibly related PRs
- parseablehq/parseable#1621 — Both PRs change the
partitioned_filescontract and its caller inStandardTableProvider; the described signatures require reconciliation.
Suggested reviewers: nikhilsinhaparseable
Merge Risk: 
6ab51
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The change prevents unverified scan metadata from removing required ORDER BY sorts, with no remaining merge-blocking risk identified.
Pre-merge checks: 
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Check name Status Explanation Resolution Docstring Coverage Docstring coverage is 10.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documenta… Write docstrings for the functions missing them to satisfy the coverage threshold. -
Check name Status Explanation Title check The title clearly and concisely describes the main change: preventing unverified Parquet sort metadata from causing incorrect ORDER BY results. Description check The description explains the defect, root cause, implementation, regression coverage, test result, and issue reference. It also completes the repository checklist and explains why documentation was no… Linked Issues check [ #1827] The coding requirements are met at reviewed head 6ab51d6.
1. Scan planning no longer trusts footer or manifest ordering.partitioned_filessetsoutput_ordered_by_time = falseunconditiona…Out of Scope Changes check Every reviewed change connects to the #1827fix or its regression test.
-without_output_orderingandUnorderedExec: the core fix. Thestatistics_from_inputs,repartitioned, and `gather_filte…Full details: Description check
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Explanation
The description explains the defect, root cause, implementation, regression coverage, test result, and issue reference. It also completes the repository checklist and explains why documentation was not added.
Full details: Linked Issues check
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Explanation
[
#1827] The coding requirements are met at reviewed head 6ab51d6.- Scan planning no longer trusts footer or manifest ordering.
partitioned_filessetsoutput_ordered_by_time = falseunconditionally.file_time_statisticsandfile_groups_are_time_orderedare removed. - Parquet scans (
without_output_ordering(plan)) and the legacyListingTablescan (without_output_ordering(listing.scan(...))) are wrapped.without_output_orderingreturnsUnorderedExec, whosePlanPropertiesuseEquivalenceProperties::new(plan.schema())and advertise no output ordering. DataFusion keeps theSortExecforORDER BY p_timestamp DESC NULLS LAST, with or withoutLIMIT. - Files persisted by earlier versions are covered. The fix acts on the scan side. The Parquet and manifest formats are unchanged.
UnorderedExecdoes not report input order as kept. Itsrepartitionedandgather_filters_for_pushdownresults are re-wrapped, so sort pushdown cannot reuse the unverified child order.- Regression tests:
writer_parquet_requires_sort_even_with_footer_orderinguses the real writer path.manifest_sort_metadata_does_not_advertise_time_ordercheckspartitioned_filesforp_timestampandevent_time. The prior assessment reports coverage of out-of-order batches, null timestamps, both providers, and limited queries. The full test body was truncated in this review, so that coverage rests on the prior assessment.
Incremental commits 4308bb1 and 838c28c add the pass-through methods. Commit 6ab51d6 makes
without_output_orderingpublic. These match the issue and the PR description. - Scan planning no longer trusts footer or manifest ordering.
Full details: Out of Scope Changes check
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Explanation
Every reviewed change connects to the
#1827fix or its regression test.without_output_orderingandUnorderedExec: the core fix. Thestatistics_from_inputs,repartitioned, andgather_filters_for_pushdownmethods keep the wrapped scan's performance. The PR description states this purpose.partitioned_files: ignores the ordering claim and returnsfalse. Thetime_columnparameter is renamed_time_columnand is now unused. This is a minor cleanup.balanced_file_groupscomment: updated to match the new no-ordering-claim behavior.#[cfg(test)]batch size from the session config: test support. Non-test builds keepPARSEABLE.options.execution_batch_size, so production behavior is unchanged.- Removed
SortOrderimport and removed tests for the deleted helpers. - New tests: they support the regression requirement.
The reviewed diff shows no unrelated product behavior or storage-format change. Diff content beyond the first 16000 bytes of
stream_schema_provider.rswas not inspected. No other file was checked in this review.
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Full details: Docstring Coverage
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Explanation
Docstring coverage is 10.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 10 functions across 1 files.
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Finishing Touches
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- Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts
A rabbit checks the rows in flight,
No footer claim can prove them right.
The scan reports no ordered stream,
While sorted queries keep their beam.
With limits set, the results align,
Then hops away through data’s line.
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Inline comments:
Review comments at @src/query/stream_schema_provider.rs:
- Around line 277-317: Update UnorderedExec to forward partition_statistics and
gather_filters_for_pushdown to self.input, and delegate repartitioned while
wrapping any returned plan with without_output_ordering. Report input-order
maintenance as true, since this wrapper does not reorder its child.
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The wrapper only hides the scan ordering, so it now forwards child statistics, repartitioned scans and parent filter pushdown. It still does not report input order as kept, so sort pushdown cannot trust the unverified parquet ordering.
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I have read the CLA Document and I hereby sign the CLA |
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hey @mvanhorn |
Fixes #1827
A query that orders by the ingest timestamp can return rows out of order after the stream has been stored as Parquet. A later timestamp can appear immediately after an earlier one, often only a millisecond or two apart. The rows and counts are otherwise correct, and the query raises no error.
The Parquet footer still declares a descending timestamp sort when rows were appended out of that order, and manifest creation copies that claim into sort_order_id. Planning treated a single file carrying that claim as time-ordered and advertised output ordering on the scan, so the sort was dropped from the physical plan. Column min and max statistics look the same for that file and for one whose rows really are sorted.
Changes:
cargo test --libpasses locally (537 passed, 1 ignored).Description
This PR has:
This change touches no documentation.
Summary by CodeRabbit